Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Organic Thin Films I (joint session CPP/DS/HL, organized by DS)

CPP 32.2: Vortrag

Mittwoch, 22. März 2017, 09:45–10:00, CHE 91

Donor-acceptor mixtures of diindenoperylene (DIP) and hexafluoro-tetracyanonaphtoquinodimethane (F6TCNNQ) studied by Polarization Modulation Infrared Reflection-Absorption Spectroscopy (PMIRRAS). New insights into the signatures of charge-transfer interactions. — •Giuliano Duva, Alexander Hinderhofer, Alexander Gerlach, and Frank Schreiber — Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen

Probing intermolecular interactions in donor:acceptor (D:A) binary mixtures of organic semiconductors (OSC) [1] requires high sensitivity techniques to overcome the intrinsic limitation of having a limited amount of material and typically a weak signal. A widely used technique for studying the effects of charge-transfer (CT) interactions on molecular vibrations is Fourier-transform IR spectroscopy (FTIR) [2]. However, interference from atmospheric water and the possibly low oscillator strength of some modes may severely limit the amount of reliable information that can be extracted from the final spectrum. We present a new approach for the study of mixtures of OSCs employing PMIRRAS as high-sensitivity technique to overcome the above limitations. Supported by the structural characterization of the films via X-ray scattering, we identify and discuss the spectral signatures of CT in correlation with the formation of D:A co-crystals. [1] A. Hinderhofer et al. Chem. Phys. Chem. 13 (2012). [2] D. Nanova et al. Org. Electr. 13 (2012).

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